Over the years there have been many languages that have come about. Each have their strengths and places in a professionals bag of tricks. Perl is very good as a "glue" language bringing together various other systems, home grown as well as purchased packages, to help build larger, customized solutions for your business. PHP, on the other hand, grew up on the web and is excellent for web applications. In fact we use it here. And there are many shops who have a heritage of shell scripts. We have expereince with all of these.